# week08 ### Come up and ask me questions for 5 mins :) --- ## SAP - Recapping what we discussed last week, plus questions - Due end of the working week -- ## Questions? --- ## OK so what happened in the lecture? -- ## Safety? --- ## Case Study Time. -- ## Stargate Ghost Problem - Daniel looks into the eye of a Crystal Skull found by explorer Nick - Nick claims looking into the skull will let you see an Alien - Daniel can no longer be seen by humans -- - Nick is in a Psychiatric Ward and the only person that can hear and speak to Daniel - Daniel and Nick need to convince everyone (the major) of what is going on and that - Daniel knows how to solve everything -- ## Assumptions - Daniel can see and hear the Major - Major cannot see and hear Daniel - Daniel cannot affect anything physically in the real world -- - There's no other communication channel apart from speaking via the Alien who relays his messages to the major - Alien can speak to Daniel -> Daniel can hear the Major - Daniel speaks to the Major through the Alien -- [Link for Jesse](https://teams.microsoft.com/l/message/19:oDCmgDBSTSfBhjw2ToHhiwzQh0AmYAveFQXNpeo4sM01@thread.tacv2/1730175756444?tenantId=3ff6cfa4-e715-48db-b8e1-0867b9f9fba3&groupId=12f49a0a-d2c4-4014-b872-c2078e586152&parentMessageId=1725941836397&teamName=COMP6441%2024T3&channelName=General&createdTime=1730175756444) -- ### Did anyone do the Houdini Case study? - Untrusted Medium - Need something that can be done without elaborate technology. - Needs to be resistant to human error - Can be used multiple times. -- ### Integrity Matters -- ### Thoughts about this study - DOS? - They already have shared secrets - Replay Attacks...